A D5 error? Are you sure you're not reading it as "d5"? If you're in the Drive Module, d5 is "distortion+". If you're in the Delay Module, d1-d9 are settings that control the mixing ratio of effect sound versus original sound and the feedback amount. I'd refer to a user manual here: https://www.zoom-na.com/sites/default/files/products/downloads/pdfs/E_G1_G1X_3.pdf Hope this helps you.
Answers & Comments
A D5 error? Are you sure you're not reading it as "d5"? If you're in the Drive Module, d5 is "distortion+". If you're in the Delay Module, d1-d9 are settings that control the mixing ratio of effect sound versus original sound and the feedback amount. I'd refer to a user manual here:
https://www.zoom-na.com/sites/default/files/products/downloads/pdfs/E_G1_G1X_3.pdf
Hope this helps you.